What did Alexander von Humboldt describe for | vedclass

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(C) Alexander von Humboldt, a German naturalist and explorer, observed that within a region, species richness increased with increasing explored area,

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Species-area relationships

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(C) Alexander von Humboldt, a German naturalist and explorer, observed that within a region, species richness increased with increasing explored area, but only up to a limit. This relationship is described as the $Species-Area$ relationship. On a logarithmic scale, this relationship is a straight line described by the equation: $log S = log C + Z log A$, where $S$ is species richness, $A$ is area, $Z$ is the slope of the line (regression coefficient), and $C$ is the $Y$-intercept.

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